Strategies on energy loss reduction from high-temperature steam for stable hydrogen production using solid-recovered fuel

Sunhee Oh, Seonggon Kim, Minjeong Cho, Chong Pyo Cho, Seong Ryong Park, Yong Tae Kang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A high-temperature steam generation system to supply steam to a water electrolysis system was designed and tested using solid-recovered fuel (SRF). The energy loss must be reduced to supply hydrogen production stably, which are conducted by three strategies: (a) using a double pipe, (b) installing a baffle inside the pipe to obstruct steam flow, and (c) bypassing the overflowing steam. Double pipe reduced energy loss by 25% compared to single pipe. Consequently, a heat source with a temperature of 973 K or higher was obtained. In addition, CFD simulation was performed over a temperature range of 373 to 973 K to investigate the change in energy loss with the temperature of the external fluid. When the three baffles were installed inside the double pipe, it reduced heat dissipation approximately 6%. Therefore, installing three or four inner baffles inside the double tube proved to be the most effective method, and it was confirmed that the temperature of the external fluid should be maintained above 573 K. It was concluded that the system using the double pipe with inner baffles can produce approximately 43.8 ton/year of hydrogen when generating high-temperature steam, and the CO2 emission is reduced to 1.1 ton-CO2/ton-hydrogen compared to liquefied natural gas.

Original languageEnglish
Pages (from-to)7542-7555
Number of pages14
JournalInternational Journal of Energy Research
Volume46
Issue number6
DOIs
Publication statusPublished - 2022 May

Bibliographical note

Funding Information:
This study was conducted under the framework of the research and development program of the Ministry of Environment (2016000710007) and under the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF‐2020R1A5A1018153). NOMENCLATURE bias uncertainty area (m ) random standard uncertainty diameter (m) inside diameter of the inner pipe (m) outside diameter of the inner pipe (m) inside diameter of the outer pipe (m) outside diameter of the outer pipe (m) carbon emission (tC) CO emissions (tCO ) friction factor CO conversion factor (tC/TJ) Gr Grashof number gravity (m/s) heat generation (MJ /Nm ) air‐side heat transfer coefficient (W/m K) inside heat transfer coefficient (W/m K) outside heat transfer coefficient (W/m K) radiant heat transfer coefficient (W/m K) solid thermal conductivity (W/m K) Nusselt number in natural convection Nusselt number in forced convection mass flow rate (kg/hour) pressure (MPa) Prandtl number fuel consumption (Nm ) heat loss from the pipe (W) heat transfer rate of steam (kJ/hour) overall heat transfer coefficient (W/m K) Reynolds Number Rayleigh Number T temperature (K) experimental uncertainty experimental value first point of the steam outlet pipe (m) end point of the steam outlet pipe (m) Greek symbol thermal diffusion coefficient (m /s) thermal expansion coefficient standard devitation emissivity rate of dissipation viscosity (kg/m s) density (kg/m ) Stefan‐Boltzmann constant kinematic viscosity (m /s) fuel heating value (MJ) Subscripts air free convection hydraulic forced convection steam surface inlet outlet radiation thickness Acronyms CFD computational fluid dynamics HTSG high‐temperature steam generator LNG liquefied natural gas SRF solid recovered fuel SOEC solid oxide electrolysis cell 2 B D 2 2 2 3 3 2 3 2

Funding Information:
National Research Foundation of Korea, Grant/Award Number: 2020R1A5A1018153 Funding information

Publisher Copyright:
© 2022 The Authors. International Journal of Energy Research published by John Wiley & Sons Ltd.

Keywords

  • energy loss reduction
  • high-temperature steam
  • hydrogen production
  • solid-recovered fuel

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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